this is a tricky one. how you would go about it depends on what your doing with the space left over.
If your going to a different distro just pop in the install cds and overwrite the suse partition(s)
If your going to using it for windows then your best bet is a comlete format however there are other options if you give us more details.
Also I'm not completely understanding the question , my bad, sorry if I'm not making sence.